Yes

you do need a jacket based on the weather in Cambridge, UK 1 second ago

Why? Because there's a refreshing nip in the air!

45°F7°C & Partly Cloudy

Wind is 4 mph7 km/h from the Southwest, gusting to 7 mph12 km/h

Date	Low	High	Wind	Day	Night
January 14	41°F5°C	50°F10°C	3 mph6 km/h from Southwest	Mostly Cloudy	Partly Cloudy
January 15	39°F4°C	47°F8°C	7 mph12 km/h from South	Mostly Cloudy	Mostly Cloudy
January 16	35°F2°C	44°F7°C	6 mph10 km/h from South	Partly Cloudy	Partly Cloudy
January 17	33°F1°C	39°F4°C	5 mph8 km/h from South	Mostly Cloudy	Mostly Cloudy
January 18	33°F1°C	39°F4°C	6 mph10 km/h from South	Mostly Cloudy	Mostly Cloudy
January 19	37°F3°C	45°F7°C	9 mph14 km/h from Southwest	Mostly Cloudy	Cloudy
January 20	35°F2°C	44°F6°C	5 mph8 km/h from South	Cloudy	Cloudy

Low of 39°F4°C, High of 46°F8°C
Wind: 7 mph12 km/h
Precipitation: None